tree a2af4f3dcd32c0d6dbb271a71e76cf3cee91f0df
parent 08fd9a82fda86529bb2f2af3c2f7cb657b4d3066
author Thinh Nguyen <Thinh.Nguyen@synopsys.com> 1533266236 -0700
committer Felipe Balbi <felipe.balbi@linux.intel.com> 1541486447 +0200

usb: dwc3: gadget: Properly check last unaligned/zero chain TRB

Current check for the last extra TRB for zero and unaligned transfers
does not account for isoc OUT. The last TRB of the Buffer Descriptor for
isoc OUT transfers will be retired with HWO=0. As a result, we won't
return early. The req->remaining will be updated to include the BUFSIZ
count of the extra TRB, and the actual number of transferred bytes
calculation will be wrong.

To fix this, check whether it's a short or zero packet and the last TRB
chain bit to return early.

Fixes: c6267a51639b ("usb: dwc3: gadget: align transfers to wMaxPacketSize")
Cc: <stable@vger.kernel.org>
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>